package mapStudy;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class mapStudy {
    public static void main(String[] args) {
        Map<String,Integer> map=new HashMap<>();
        map.put("a",1);
        map.put("b",Integer.valueOf(2));
        System.out.println(map.size());

        for (String key:map.keySet()){
            System.out.println(map.get(key));
        }
    }
}
